Switch for controlling the lighting circuits of cinematograph apparatus



1929- H. KUCHARSKI ET AL 1,725,234

SWITCH FOR CONTROLLING THE LIGHTING CIRCUITS 0F CINEMATOGRAPH APPARATUS Filed Dec. 8 1925 2 Sheets-Sheet l 1929- H. KUCHARSKI ET AL 1,725,28

SWITCH FOR CONTROLLING THE LIGHTING CIRCUITS OF CINEIATOGRAPH APPARATUS Filed Doc. 1925 2 Sheets-Sheet 2 Patented Aug. 20, 1929.

UNITED STATES HANS xucnansxr, or BERLIN, AND max wI'EsxE, nncnasnn, term or BERLIN, om

mm, BY Anna wrnsxn, min wannrrz, amrmrs'raararx, or isnanm, enamr, assronons'ro uNrvrmsum-rrnm-axrmnonsnnnscnu'r, or nmmm, enaswrrcn non CONTROLLING THE men'rme outcome or cmmroomn arrmrus.

Application filed December 8, 1925, Serial No. 74,189, and in Germany December 12, 1924.

We have filed applications for patents in: Germany on December 12, 1924; Austria on June 30, 1925; Switzerland 'on June 30, 1925; The Netherlands on July 2, 1925; Belgium on July 7, 1925; France on July 4,

1925; Italy on July 15, 1925; Great Britain on July 16, 1925.

Our invention relates to a switch for the li hting circuit of cinematograph apparatus 0% the type in which the operation of the switch is influenced by the air pressure in a pipe line supplying cooling air to the film while it is moving to the apparatus, and it is an object of our invention to provide a switch of the kind described, b which the lighting circuitis controlled ireotly and not by a contact in a shunt comprising a magnet coil, the armature of which controls the contact of the lighting circuit and in which the switch for the main circuit is operated independently of the contact.

It is also an object of our invention to interlock the switch with the cooling air system so that the lighting circuit can only be thrown in when the cooling air supply is in properoperation. To this end wefprov vide locking means for the switch which rest said switch in its final, that is cut-in and cutout positions, said locking means being controlled by the pressure in the cooling system,

so asto lock and release said switch at the proper time.

In the drawings afiixed to this specification and forming part thereof a switch embodying our invention is illustrated diagrammatically by way of example.

In the drawings- Figs. 1 and 2 are plan views of our improved switch in its cut-out and cut-in position, respectively,

Fig. 3 is a section on the line IIIIII in Fig. 4is a diagram'showing a complete apparatus, with our switch applied.

Referring now to the drawings, A is a switch board to which our switch and the mechanism connected therewith is attached, 1 is a switching handle on a pivoted member 2 which is adapted to rock about the pins 3 and 4 of a blade 5 comprising switch blades 6 and 7 which in the cut-in position of Fig.

2 engage the contacts 6, 6 of the lamp tions in and out.

The-arm B of the member 2 which is opposite the blade-holder 5 and fulcrumed on the base plate at 25, engages a slotted guide 9 formed by the two parts of a frame 10, 11. 12 and 13 are parallel arms extending along the frame 10, 11, and connected by: stays 14 and 15, which are free to slide in holes 16 and 17 of the frame. Pins 18 and 19 are secured on both sides of the frame 10, 11 and extend through holes in the arms 12 and 13. A spring 20 is secured on the pin 19 between the parts 10 and 12 and tends to hold the frame in the position shown in Fig. 1. It will be understood that any number of springs may be provided and that they may be tension instead of compression springs.

Adjustable checks 21, 22 are secured in the arm 12, said checks being preferably set screws which may be locked by any suitable means.

Pins 23 and 24 are secured on the'arms 12 and 13, respectively, and adapted to respectively engage holes 26, 26 in the frame 10,

11, and a corresponding hole 26" in the arm 8, as determined by the position of the frame 12, 13. In the cut-out position of Fig. 1 the in 24 is in its hole, and so is the pin 23 1n the cut-in position of. Fig. 2. The ends of the pins are beveled as shown. Both pins are adapted to engage a hole 26" in the arm 8 in the corresponding positions of the memher 2. A pull-back spring 27 is connected to the member 2 at one end and to a fixed point at the other. 30 is a piston in a cylinder 29, the rod 28 of which is secured to the arm 12. 31 is a pipe connecting the cylinder 29 with the pipe line 36 for the cooling air system, 35 is a pipe connecting the cylinder with the pipe line 36, leading to the film gate 37. 33 is a compressor connected with the line 32, and 34 is an electric motor directly connected with the compressor. Obviously, any other means may be provided for compressing air in the air system. 38 is the film which is cooled by the compressed air from the film gate 37 and 39 is the lantern.

24 enga ing ole 26. When, however, cool-' ing an is flowing 1n its pipe line, the plston 30 is moved to the right against the spring 20 and the pin 24 is moved out of its hole, releasing the member 2, which is now free to be thrown over into the cut-in position of Fig. 2 against the action of spring 27. The two end, positions of the member 2 are defined by' inclined faces at the ends of the frame 10, 11, as shown in Fig. 3.

Then the arm 8 meets the beveled end of the pin 23 it pushes back the frame 12, 13 against the pressure on the piston 30. lVhen the member is in the cut-in position of Fig. 2, the pin 23 engages the hole 26" and thus locks the member in its cut-in position.

The switch is held in this position as long as the piston 30 is under the pressure of the cooling air from the pipe 31, that is, while cooling air is flowing to the film. When the cooling air supply fails or its pressure is substantially reduced, the piston is returned to' the left by the spring 20, and the pin 23 is moved out of the hole in the arm 8 and the spring 27 automatically moves the member 2 into the cut-out position of Fig. 1, from which, as mentioned, it cannot be moved unless the locking by the pin 24 is released by the air pressure in the cylinder.

We wish it to be understood that we do not desire to be limited to the exact details of construction shown and described, for obvious modifications will occur to a person skilled in the art.

We claim 1. A moving-picture machine, comprising a film gate, a pipe line "for supplying a cooling medium to said gate, a lantern, a line for supplying energy to said lantern, a switch in said energy-supplying line, stops defining the two end positions of said switch, locking means for said switch, and means for controlling said locking means, said controlling means being under the influence of variations of pressure in said pipe line.

2. A moving-picture machine, comprising a film gate, a pipe line for supplying a cooling medium to said gate, a lantern, a line for supplying energy to said lantern, a switch in said energy-supplying line, stops defining the two end positions of said switch, locking means for said switch, and means for cbiriirlf' trolling said locking means, said controlling of pressure in said pipe line, and automatic means for moving said switch, after it has been released by said locking means.

3. A moving-picture machine, comprising a film gate, a. pipe line for supplying a cooling medium to said gate, a lantern, a line for opera le switch in said energy-supplying line, stops defining the two end positions of said switch, locking meansfor said switch, and means for controlling said locking means, said controlling means being under the influence of variations of pressure in said pipe line.

1. A moving-picture machine, comprising a film gate, a pipe line for supplying a cooling medium to said gate, a lantern, a line for supplying energy to said lantern, a switch in said energy-supplying line, stops defining the two end positions of said switch, two locking pins, each adapted to lock said switch in one of its end positions and means operatively connected with said pipe line and controlled by the variations of pressure therein for displacing said pins relative to said switch.

5. A moving-picture machine, comprising a film gate, a pipe line for supplying a cooling medium to said gate, a lantern, a line for supplying energy to said lantern, a switch in said energy-supplying line, stops defining the two end positions of said switch, a reservoir defining a chamber in said pipe line, a movable part adapted to reciprocate in said chamber under the influence of the variations of pressure in said pipe line, and two locking pins operatively connected with said part and each adapted to lock said switch in one of its end positions.

6. A moving-picture machine, comprising a film gate, a pipe line for supplying a cooling medium to said gate, a lantern, a line for supplying energy to said lantern, a pivoted member, a pull-back spring operatively connected with said member, stops defining the two end positions of said member, contact means on said member, two locking pins each adapted to lock said .member in one of its end positions, and means operatively connected with said pipe line and controlled by the variations of the pressure therein for displacing said pins with respect to said mem- In testimony whereof we afiix our signatures.

HANS KUCHARSKI. ANNA WIESKE min WABNITZ, Administratm'w of Maa Wieske, deceased.

supplying energy to said lantern, a manually i 

